Some 11 million people have come to the United States, or stayed here, illegally, according to researchers, the number may actually under-represent the number of people who are affected. In many cases, U.S. citizen children are also disadvantaged by their undocumented parents.

11 million. It's the estimated number of immigrants living in the US illegally. But how did we even get to that figure? From the public radio collaboration Fronteras Desk, reporter Adrian Florido finds out.

11 million. It's the estimated number of immigrants living in the US illegally. But how did we even get to that figure? From the public radio collaboration Fronteras Desk, reporter Adrian Florido finds out.

Some 11 million people have come to the United States, or stayed here, illegally, according to researchers, the number may actually under-represent the number of people who are affected. In many cases, U.S. citizen children are also disadvantaged by their undocumented parents.